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application manual dc/dc converter controller rv5vh series no. ea-049-0006
1 dc/dc converter controller rv5vh series outline each of the rv5vh series is dual output cmos dc/dc converter ics integrating step-up and inverting dc/dc convert- ers. the rv5vh3 series ics consists of an oscillator, two vfm control circuits, control transistors(ext switches), a phase shift circuit, a voltage reference unit, an error amplifier, and voltage sensing resistors. the package for the rv5vh series is 8pin ssop(0.65mm pitch), and it is suitable for power supply systems with positive and negative output, such as pager, pda, which need power supplies for lcd. rv5vh1 and rv5vh2 series are able to provide two dc/dc converters, one is a step-up dc/dc converter with internally fixed output and the other is an inverting dc/dc converter with adjustable output by external resistors. a volt- age detector with sensing pin is also included. rv5vh3 series are able to provide two dc/dc converters, both of them require external drivers, dc/dc1, and inverting one, dc/dc2, can be adjustable by resistors. features ? dual dc/dc converter system ................................. dc/dc1 : step-up dc/dc2 : inverting(negative voltage) ? voltage detector .......................................................... nch. open drain output ? low voltage operation available rv5vh1 ,rv5vh2 .......................................... oscillator start-up from 0.8v rv5vh3 ................................................................. oscillator start-up from 1.8v ? high efficiency ............................................................. typ. 80% ? low supply current ? high accuracy feedback sensing ............................... typ. 2.5% ? sleep mode rv5vh1 , rv5vh2 .......................................... dc/dc 2 rv5vh3 ................................................................. dc/dc1, 2 ? available to adjust temperature drift ......................... dc/dc2 : with external resistor (rv5vh2 , rv5vh3 ) coefficient of output voltage ? small package .............................................................. 8pin ssop(0.65mm pitch) applications ? power source for telecommunication systems ? power source for portable data processing systems, e.g. pda, electronic data banks ? power source for audio-visual systems, e.g. cd players, video cameras ? power source for notebook pcs, word processing systems ? gadgets which need two power supplies, e.g. cpu and lcd
2 block diagram + + csw v sen v out1 l x1 d out fb ext2 gnd vref error amp.1 error amp.2 1 2 3 4 8 7 6 5 vfm2 v lx lim. vfm1 osc p_shift + dc/dc converter controller (boost / inverting) rv5vh1 / rv5vh2 ? rv5vh1 + + csw v sen v out1 ext1 d out fb ext2 gnd vref error amp.1 error amp.2 1 2 3 4 8 7 6 5 vfm2 vfm1 osc p_shift + ? rv5vh2
3 rv5vh1 /rv5vh2 pin configuration 1 2 3 4 8 7 6 5 ? 8 pin ssop (0.65mm pitch) pin description ? rv5vh1 pin no. symbol description 1 csw control switch for dc/dc2 2v sen sensing pin for voltage detector 3v out1 output for dc/dc1, power supply for the device 4l x1 output for dc/dc1, switching (nch open-drain) 5 gnd ground 6 ext2 external transistor drive pin for dc/dc2 (cmos output) 7 fb input for dc/dc2 error amplifier 8d out output for voltage detector ? rv5vh2 pin no. symbol description 1 csw contol switch for dc/dc2 2v sen sensing pin for voltage detector 3v out1 output for dc/dc1, power supply for the device 4 ext1 external transistor drive pin for dc/dc1 (cmos output) 5 gnd ground 6 ext2 external transistor drive pin for dc/dc2 (cmos output) 7 fb input for dc/dc2 error amplifier 8d out output for voltage detector
rv5vh1 /rv5vh2 4 absolute maximum ratings ? rv5vh1 symbol item ratings unit v out1 v out1 pin voltage 12 v v lx1 l x1 pin voltage 12 v v sen v sen pin voltage 12 v d out d out pin voltage 12 v v csw csw pin voltage C0.3 to v out1 +0.3 v v ext2 ext2 pin voltage C0.3 to v out1 +0.3 v v fb fb pin voltage C0.3 to v out1 +0.3 v i lx1 l x1 output current 400 ma i ext2 ext2 output current 50 ma p d power dissipation 300 mw topt operating temperature C40 to +85 ?c tstg storage temperature C55 to +125 ?c tsolder lead temperature (soldering) 260?c 10sec
5 rv5vh1 /rv5vh2 absolute maximum ratings absolute maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. moreover, such values for any two items must not be reached simultaneously. operation above these absolute maximum ratings may cause degradation or permanent damage to the device. these are stress ratings only and do not necessarily imply functional operation below these limits. ? rv5vh2 symbol item ratings unit v out1 v out1 pin voltage 12 v v sen v sen pin voltage 12 v d out d out pin voltage 12 v v csw csw pin voltage C0.3 to v out1 +0.3 v v ext1, 2 ext1, 2 pin voltage C0.3 to v out1 +0.3 v v fb fb pin voltage C0.3 to v out1 +0.3 v i ext1, 2 ext1, 2 output current 50 ma p d power dissipation 300 mw topt operating temperature C40 to +85 ?c tstg storage temperature C55 to +125 ?c tsolder lead temperature (soldering) 260?c 10sec
rv5vh1 /rv5vh2 6 electrical characteristics ? rv5vh101 dc/dc converter 1 * ) v in =1.2v, i out =10ma, topt=25?c, unless otherwise specified. (see typical application) * 1 ) this value only shows the supply current of dc/dc1, not include the supply current of voltage detector and external resisto rs. symbol item conditions min. typ. max. unit v out1 step-up output voltage 2.925 3.000 3.075 v v in max maximum input voltage 10 v vstart oscillator start-up voltage no load 0.7 0.8 v vhold hold-on input voltage i out =1ma, v in :2 ? 0v 0.7 v i ss1 supply current1 * 1 no load, csw=l 10 a i lx l x switching current v lx =0.4v 100 ma i lxleak l x leakage current v lx =6.0v, v in =3.5v 0.03 1 a fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle on (v lx =l) 50 65 80 % h efficiency 80 % v lxlim voltage limit for l x switch for l x pin 0.4 0.8 v d v out1 output voltage temp. coefficient C40?c topt 85?c 100 ppm/?c d topt v out1 =3.0v, topt=25?c
7 rv5vh1 /rv5vh2 dc/dc converter 2 symbol item conditions min. typ. max. unit v set set output voltage * 1 0v v fb feed back voltage C20 0 20 mv v in maximum input voltage 10 v v opt min minimum operating voltage i out =1ma 1.8 v i ss2 supply current2 csw= h at no load 10 a istandby standby current csw=l 0.3 a i ext2h ext2 h output current v ext2 =v out1 C0.4v 2 4 ma i ext2l ext2 l output current v ext2 =0.4v 4 8 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle v ext2 =h 40 50 60 % v cswh csw h input voltage v out1 =3.0v 1.6 v out1 v v cswl csw l input voltage v out1 =3.0v 0 0.4 v i cswleak csw input leakage current v out1 =3.0v C0.5 0.5 a d v fb feed back voltage temp. coefficient C40?c topt 85?c 30 v/?c d topt * ) v out1 =3.0v, i out =1ma, topt=25?c, unless otherwise specified. (see typical application) * 1 ) adjustable by external resistors to -30v. v out1 =3.0v, topt=25?c
rv5vh1 /rv5vh2 8 symbol item conditions min. typ. max. unit v det detector threshold 2.633 2.700 2.767 v v hys detector threshold hysteresis 0.081 0.135 0.189 v i ss3 supply current3 1.2 a v in max maximum input voltage 10 v v opt min minimum operating voltage 1.8 v i out output current v ds =0.5v, v out1 =1.5v 1.0 2.0 ma v ds =0.5v, v out1 =3.0v 4.0 5.0 ma i sen sensing pin input current v sen =3.0v 0.3 1.2 a v sen sensing pin input voltage 0.7 10 v t plh output delay 100 s d v out1 detector threshold temp.coefficient C40?c topt 85?c 100 ppm/?c d topt i doutleak d out leakage current 0.03 0.5 a v out1 =3.0v, topt=25?c voltage detector * ) v out1 =3.0v, topt=25?c, unless otherwise specified. (see typical application)
9 rv5vh1 /rv5vh2 ? rv5vh102 dc/dc converter 1 * ) v in =1.2v, i out =10ma, topt=25?c, unless otherwise specified. (see typical application) * 1 ) this value only shows the supply current of dc/dc1, not include the supply current of voltage detector and external resisto rs. v out1 =5.0v, topt=25?c symbol item conditions min. typ. max. unit v out1 step-up output voltage 4.875 5.000 5.125 v v in max maximum input voltage 10 v vstart oscillator start-up voltage no load 0.7 0.8 v vhold hold-on input voltage i out =1ma, v in :2 ? 0v 1.2 v i ss1 supply current1 * 1 no load, csw=l 15 a i lx l x switching current v lx =0.4v 100 ma i lxleak l x leakage current v lx =6.0v, v in =5.5v 0.03 1 a fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle on (v lx =l) 55 70 85 % h efficiency 80 % v lxlim voltage limit for l x switch 0.4 0.8 v d v out1 output voltage temp. coefficient C40?c topt 85?c 100 ppm/?c d topt
rv5vh1 /rv5vh2 10 dc/dc converter 2 v out1 =5.0v, topt=25?c symbol item conditions min. typ. max. unit v set set output voltage * 1 C3.000 0 v v fb feed back voltage 0 mv v in maximum input voltage 10 v v opt min minimum operating voltage i out =1ma 1.8 v i ss2 supply current2 csw= h at no load 25 a istandby standby current csw=l 0.3 a i ext2h ext2 h output current v ext2 =v out1 C0.4v 3 6 ma i ext2l ext2 l output current v ext2 =0.4v 7 14 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle v ext2 =h 40 50 60 % v cswh csw h input voltage v out1 =5.0v 1.6 v out1 v v cswl csw l input voltage v out1 =5.0v 0 0.4 v i cswleak csw input leakage current v out1 =5.0v C0.5 0.5 a d v fb feed back voltage temp. coefficient C40?c topt 85?c 30 v/?c d topt * ) v out1 =3.0v, i out =1ma, topt=25?c, unless otherwise specified. (see typical application) * 1 ) adjustable by external resistors to -30v.
11 rv5vh1 /rv5vh2 voltage detector v out1 =5.0v, topt=25?c symbol item conditions min. typ. max. unit v det detector threshold 4.388 4.500 4.612 v v hys detector threshold hysteresis 0.135 0.225 0.315 v i ss3 supply current3* 1 1.8 a v in max maximum input voltage 10 v v opt min minimum operating voltage* 2 1.8 v i out output current v ds =0.5v, v out1 =1.5v 1.0 2.0 ma v ds =0.5v, v out1 =5.0v 7.0 10.0 ma i sen sensing pin input current v sen =5.0v 0.7 2.0 a t plh output delay 100 s d v out1 detector threshold temp.coefficient C40?c topt 85?c 100 ppm/?c d topt i doutleak d out leakage current 0.03 0.5 a * ) v out1 =3.0v, topt=25?c, unless otherwise specified. (see typical application)
rv5vh1 /rv5vh2 12 symbol item conditions min. typ. max. unit v out1 step-up output voltage i out =0ma 2.925 3.000 3.075 v v in max maximum input voltage 10 v vstart oscillator start-up voltage no load 0.7 0.8 v vhold hold-on input voltage i out =1ma 0.7 v i ss1 supply current1 * 1 i out =0ma, csw=l 80 a i ext1h ext1 h output current v ext2 =v out1 C0.4v 1.5 3 ma i ext1l ext1 l output current v ext2 =0.4v 4 8 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle on (v lx =l) 50 65 80 % d v out1 output voltage temp. coefficient C40?c topt 85?c 100 ppm/?c d topt ? rv5vh201 dc/dc converter 1 v out1 =3.0v, topt=25?c * ) v in =1.2v, i out =10ma, unless otherwise specified. (see typical application) * 1 ) this value shows only the supply current of dc/dc1, not include the supply current of voltage detector and external resisto rs.
13 rv5vh1 /rv5vh2 symbol item conditions min. typ. max. unit v set output voltage setting range * 1 0v v fb feed back voltage C20 0 20 mv v in maximum input voltage 10 v v opt min minimum operating voltage* 2 i out =1ma 1.8 v i ss2 supply current2* 3 csw= h i out =0ma 10 a istandby standby current csw=l 0.3 a i ext2h ext2 h output current v ext2 =v out1 C0.4v 2 4 ma i ext2l ext2 l output current v ext2 =0.4v 4 8 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle v ext2 =h 40 50 60 % v cswh csw h input voltage v out1 =3.0v 1.6 v out1 v v cswl csw l input voltage v out1 =3.0v 0 0.4 v i cswleak csw input leakage current csw=3.0v C0.5 0.5 a d v fb feed back voltage temp. coefficient C40?c topt 85?c 30 v/?c d topt dc/dc converter 2 * ) v out1 =3.0v, v out2 =-0.3v, i out2 =1ma, unless otherwise specified. (see typical application) * 1 ) adjustable by external resistors to -30v. * 2 ) minimum operating voltagemeans a voltage for the v out1 pin. * 3 ) this value shows only the supply current of dc/dc2, not include the supply current of external resistors. v out1 =3.0v, topt=25?c
rv5vh1 /rv5vh2 14 voltage detector v out1 =3.0v, topt=25?c symbol item conditions min. typ. max. unit v det detector threshold 2.633 2.700 2.767 v v hys detector threshold hysteresis 0.081 0.135 0.189 v i ss3 supply current3* 1 1.2 a v in max maximum input voltage 10 v v opt min minimum operating voltage* 2 1.8 v i out output current v ds =0.5v, v out1 =1.5v 1.0 2.0 ma v ds =0.5v, v out1 =3.0v 4.0 5.0 ma i sen sensing pin input current v sen =3.0v 0.3 1.2 a t plh output delay 100 s d v out1 detector threshold temp.coefficient C40?c topt 85?c 100 ppm/?c d topt i doutleak d out leakage current 0.03 0.5 a * ) v out1 =3.0v : unless otherwise specified. (see typical application) * 1 ) this value only shows the supply current of voltage detector. * 2 ) minimum operating voltagemeans a voltage for the v out1 pin.
15 rv5vh1 /rv5vh2 ? rv5vh202 dc/dc converter 1 v out1 =5.0v, topt=25?c * ) v in =3.0v, i out =10ma : unless otherwise specified. (see typical application) * 1 ) this value only shows the supply current of dc/dc1, does not include the supply current of voltage detector and external re sistors. symbol item conditions min. typ. max. unit v out1 step-up output voltage i out =0ma 4.875 5.000 5.125 v v in max maximum input voltage 10 v vstart oscillator start-up voltage no load 0.7 0.8 v vhold hold-on input voltage i out =1ma 0.7 v i ss1 supply current1 * 1 i out =0ma, csw=l 40 a i ext1h ext1 h output current v ext2 =v out1 C0.4v 2 4 ma i ext1l ext1 l output current v ext2 =0.4v 7 14 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle on (v lx =l) 55 70 85 % h efficiency 80 % d v out1 output voltage temp. coefficient C40?c topt 85?c 100 ppm/?c d topt
rv5vh1 /rv5vh2 16 dc/dc converter 2 * ) v out1 =5.0v, v out2 =C3.0v, i out2 =1ma : unless otherwise specified. (see typical application) * 1 ) adjustable by external resistors to -30v. * 2 ) minimum operating voltagemeans a voltage for the v out1 pin. * 3 ) this value shows only the supply current of dc/dc2, not include the supply current of external resistors. symbol item conditions min. typ. max. unit v set output voltage setting range * 1 0v v fb feed back voltage 0 mv v in maximum input voltage 10 v v opt min minimum operating voltage* 2 i out =1ma 1.8 v i ss2 supply current2* 3 csw= h, no load 25 a istandby standby current csw=l 0.3 a i ext2h ext2 h output current v ext2 =v out1 C0.4v 3 6 ma i ext2l ext2 l output current v ext2 =0.4v 7 14 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle v ext2 =h 40 50 60 % v cswh csw h input voltage v out1 =5.0v 1.6 v out1 v v cswl csw l input voltage v out1 =5.0v 0 0.4 v i cswleak csw input leakage current csw=5.0v C0.5 0.5 a d v fb feed back voltage temp.coefficient C40?c topt 85?c 30 v/?c d topt v out1 =5.0v, topt=25?c
17 rv5vh1 /rv5vh2 voltage detector v out1 =5.0v, topt=25?c * ) v out1 =5.0v : unless otherwise specified. (see typical application) * 1 ) this value only shows the supply current of voltage detector. * 2 ) minimum operating voltagemeans a voltage for the v out1 pin. symbol item conditions min. typ. max. unit v det detector threshold 4.388 4.500 4.612 v v hys detector threshold hysteresis 0.135 0.225 0.315 v i ss3 supply current3* 1 1.8 a v in max maximum input voltage 10 v v opt min minimum operating voltage* 2 1.8 v i out output current v ds =0.5v, v out1 =1.5v 1.0 2.0 ma v ds =0.5v, v out1 =5.0v 7.0 10.0 ma i sen sensing pin input current v sen =5.0v 0.7 2.0 a t plh output delay 100 s d v out1 detector threshold temp.coefficient C40?c topt 85?c 100 ppm/?c d topt i doutleak d out leakage current 0.03 0.5 a
rv5vh1 /rv5vh2 18 operation ? dc/dc converter 1 the dc/dc1 uses input voltage as an initial power supply, once boost operation is started, the boost output will be used for the power supply of device itself. a change in the v out1 will feed back to the internal error amplifier through external voltage setting resistors and internal feed back resistors. when the feed back voltage is lower than the reference voltage the error amplifier enables oscllation or otherwise will stop oscillation. the internal feed back resistor r which is fixed and adjusted by laser trim can make the feed back input voltage to error amp.1 stable. pulses from the osc circuit have a duty cycle of 50% and it becomes 65 to 75%(at high side) through the p_shift circuit. the duty cycle may be smaller with light load spontaneously. these clook pulses control vfm circuit and make it possible to operate as a boost converter. the output of l x1 is nch open drain, while the output of ext1 is driven by cmos buffer and an external nmos driver is also available instead of an npn transistor, in such cases the rb and the cb are not necessary. a recommended rb is 300 w. when you use a mos- fet for the ext1, the input voltage should be high enough and you can get high effiiciency applications. a current limit is available only for the rv5vh1 series, to prevent an excess current from flowing through nch driver tran- sistor. the dc/dc1 can be shut down by csw pin. when the csw pin is high, v dd level, the dc/dc1 is enabled and when the csw pin is l, gnd level, the dc/dc1 is disabled. the ext1 pin outputs l while the dc/dc1 is disabled. c l sbd v out1 v out1 l x1 r + v lx lim. osc vref p_shift vfm1 v in rv5vh1 error amp.1 3 4 c l1 sbd v out1 v out1 ext1 r + osc vref p_shift v in rv5vh2 error amp.1 vfm1 npn tr. cb 3 4 rb
19 rv5vh1 /rv5vh2 c1 l fb v out2 v out1 ext2 + rv5vh1 /rv5vh2 error amp.2 vfm2 csw 6 1 7 sbd + pmos osc c2 r2 r1 the dc/dc2 can operate by a voltage of v out1 . a change in the v out2 will feed back to the internal error amplifier through external voltage setting resistors. the reference voltage should be provided from externally fixed power supply such as v out1 . when the feed back voltage to the cmp2 is higher than the ground voltage the error amplifier enables oscillation or other- wise will stop oscillation. pulses from the osc circuit have a duty cycle of 50% and it makes vfm operation allowable. there might be certain cases that the duty cycles becomes smaller temporarily at light load current. the output of ext2 is driven by cmos buffer operated v out1 and gnd. a pmos driver will be connected to the ext2 pin and its switching operation generates negative output voltage through energy accumulated in an inductor. the dc/dc1 can be shut down by csw pin. when the csw pin is h, v dd level, the dc/dc1 is enabled and when the csw pin is l, gnd level, the dc/dc1 is disabled. the ext2 pin outputs high while the dc/dc2 is disabled. ? set output voltage dc/dc converter2 v out2 is described as follows: v out1 :r1=|Cv out2 | : r2 / the fb voltage is controlled to 0v and v out1 is provided externally |Cv out2 |=v out1 r2/r1 thus, any output voltage of dc/dc2 can be set by changing r1 or/and r2. certain temperature coefficient of v out2 can be set by using r1,r2 having such temperature characteristics. ? dc/dc converter 2
rv5vh1 /rv5vh2 20 v sen d out rv5vh1 /rv5vh2 pull-up output tr. + vref ra rb rc tr.1 2 8 the vd can operate by the voltage of v out1 . the detector threshold and the reset voltage are internally adjusted by trimmed resistors and the vd monitors v sen pin voltage. the d out is nch open-drain output and a pull up resistor is necessary. oepration diagram v sen pin is pulled up to v out1 voltage ? voltage detector a b reset voltage detector threshold gnd gnd output voltage 1 2 3 4 5 hysteresis range +v det ? det step step 1 step 2 step 3 step 4 step 5 comparator(+) pin input voltage abbba comparator output hlllh tr. 1 off on on on off output tr off on indefinite on off a: rb+rc v sen ra+rb+rc b: rb v sen ra+rb+rc step 1. output voltage is equal to pull-up voltage. step 2. when input voltage (v sen ) reaches the state of vref 3 v sen (rb rc)/(ra+rb+rc) at point a, the output of the comparator is reversed. so that the output voltage becomes to gnd. step 3. output voitage becomes indefinite when power source voltage (v sen ) is smaller than minimum operating voitage. when the output is pulied up, output becomes pull-up voltage and gnd. step 4. output voitage becomes to gnd. step 5. when input voltage(v sen ) reaches the state of vref v sen rb/(ra+rb) at point b, the output of the comparator is reversed, so that the output voltage becomes to pull-up voltage.
21 rv5vh1 /rv5vh2 operation of step-up dc/dc converter step-up dc/dc converter charges energy in the inductor when lx transistor (lxtr) is on, and discharges the energy with the addition of the energy from input power source thereto, so that a higher output voltage than the input voltage is obtained. the operation will be explained with reference to the following diagrams : < current through l > < basic circuits > i2 l sd i out v out cl lx tr i1 v in il ilmin ilmax topen t ton toff t=1/fosc step 1 : lxtr is turned on and current il (=i1 ) flows, so that energy is charged in l. at this moment, il(=i1 ) is increased from ilmin (=0) to reach ilmax in protection to the on-time period (ton) of lxtr. step 2 : when lxtr is turned off, schottky diode (sd) is turned on in order that l maintains il at ilmax, so that current il (=i2) is released. step 3 : il (=i2) is gradually decreased, and il reaches ilmin (=0) after a time period of topen, so that sd is turned off. in the case of vfm control system, the output voltage is maintained constant by controlling the oscillator fre- quency (fosc) with the on-time period (ton) being maintained constant. in the above two diagrams, the maximum value (ilmax) and the minimum value (ilmin) of the current which flows through the inductor are the same as those when lxtr is on and also when lxtr is off. the difference between ilmax and ilmin, which is represented by ? i, is: ? i=ilmaxCilmin=v in ton/l=(v out Cv in ) topen/l .......................................... equation 1 wherein t=1/fosc=ton+toff duty (%)=ton/t 100=ton fosc 100 topen toff in equation 1,v in ton/l and (v out Cv in ) topen/l are respectively the change in the current at on, and the change in the current at off. in the vfm system, topen < toff as illustrated in the above diagram. in this case, the energy charged in the inductor during the time period of ton is discharged in its entirely during the time period of toff, so that ilmin becomes zero (ilmin=0).
rv5vh1 /rv5vh2 22 the above explanation is directed to the calculation in an ideal case where it is supposed that there is no energy loss in the external components and lxsw. in an actual case, the maximum output current will be 50 to 80% of the above calculated maximum output current. in particular, care must be taken because v in is decreased in an amount corresponding to the voltage reduction caused by lxsw when il is large or v in is small. furthermore, it is required that with respect to v out , vf of the diode (about 0.3v in the case of a schottky type diode) be taken into consideration. when i lx and v lx exceed their respective ratings, use the rv5vh with the attachment of an external tran- sistor with a low saturation voltage thereto. hints when lxtr is on, the energy p on charged in the inductor is provided by equation 2 as follows : p on = 0 ton (v in il (t)) dt= 0 ton (v in 2 t/l) dt =v in 2 ton 2 /(2 l) .................................................................................................... equation 2 in the case of the step-up dc/dc converter, the energy is also supplied from the input power source at the time of off. thus, p off = 0 topen (v in il (t)) dt= 0 topen (v in (v out Cv in ) t/l)dt =v in (v out Cv in ) topen 2 /(2 l) here, topen=v in ton/(v out Cv in ) from equation 1, and when this is substituted into the above equation. =v in 3 ton 2 /(2 l (v out Cv in )) ............................................................................ equation 3 input power p in is (p on +p off )/t. when this is converted in its entirely to the output. p in =(p on +p off )/t=v out i out =p out ......................................................................... equation 4 equation 5 can be obtained as follows by solving equation 4 for i out by substituting equation 2 and 3 into equation 4 : i out =v in 2 ton 2 /(2 l t (v out Cv in ) =v in 2 maxdty 2 /(20000 fosc l (v out Cv in )) ................................................... equation 5 the peak current which flows through l lxtr sd is ilmax=v in ton/l .......................................................................................................... equation 6 therefore, it is necessary that the setting of the input/output conditions and the selection of peripheral compo- nents be made with ilmax taken into consideration. selection of peripheral components
23 rv5vh1 /rv5vh2 coils l1 : 27h, l2 : 220h diodes schottky type capacitors c1 : 47f(tantalum type), c2 : 22f(tantalum type) c3 : 0.01f(ceramic type) c4 : 0.01f(ceramic type) pmos 2sj238(toshiba), etc. npn tr. 2sd1628g(sanyo), etc. resistors r1 : 100k w r2 : 0-500k w r3 : 100k w r4 : 300 w typical application ? rv5vh1 csw v sen v out1 l x1 d out fb ext2 gnd c2 l1 l2 d1 pmos r3 r1 r2 c3 d2 c1 output dc/dc1 output dc/dc2 ? rv5vh2 csw v sen v out1 ext1 d out fb ext2 gnd c2 l1 l2 sbd pmos r3 r1 r2 c3 sbd c1 npn tr. c4 r4 output dc/dc1 output dc/dc2 coiis l1 : 100h, l2 : 220h diodes schottky type capacitors c1, c2 : 22f(tantalum type), c3 : 0.01f(ceramic type) tr pmos : 2sj238 resistors r1, r2 : several hundreds k w , r3 : 100k w
rv5vh1 /rv5vh2 24 test circuits csw d out fb ext2 l1=100 h,220 h gnd v sen v out1 l x1 l1 v 22 f a fig.1 test circuit 1 csw d out fb ext2 gnd v sen v out1 l x1 (ext1) 100k w 150 w a v v 5 w (150 w ) oscilloscope * ext1 * fig.2 test circuit 2 csw d out fb ext2 gnd v sen v out1 l x1 a 0.5v fig.3 test circuit 3
25 rv5vh1 /rv5vh2 test circuit 1: typical characteristics 1), 3), 5), 10), 11) test circuit 2: typical characteristics 6), 7), 8), 9), 13), 14), 15), 16), 17), 18), 19), 21) test circuit 3: typical characteristics 20) test circuit 4: typical characteristics 22) test circuit 5: typical characteristics 2), 4) typical application : typical characteristics 12) csw d out fb ext2 gnd v sen v out1 l x1 100k w pulse input oscilloscope fig.4 test circuit 4 csw d out fb ext2 gnd v sen v out1 ext1 v 96 f27 h 2200pf 300 w a fig.5 test circuit 5
rv5vh1 /rv5vh2 26 typical characteristics ? dc/dc converter 1 1) output voltage vs. output current (rv5vh1 ) rv5vh101 3.6 3.4 3.2 2.8 3.0 2.4 2.6 2.2 2.0 output current i out (ma) output voltage v out1 (v) 0 20 40 60 80 100 140 120 v in =0.9v v in =1.2v v in =1.5v v in =2.0v topt=25?c l1=100 h c1=22 f rv5vh101 3.6 3.4 3.2 2.8 3.0 2.4 2.6 2.2 2.0 output current i out (ma) output voltage v out1 (v) 0 20 40 60 80 100 140 120 topt=25?c l1=220 h c1=22 f v in =0.9v v in =1.2v v in =1.5v v in =2.0v rv5vh201 3.6 3.4 2.8 3.0 3.2 2.6 2.2 2.4 2.0 output current i out (ma) output voltage v out (v) 0 100 200 300 400 500 topt=25?c l1=27 h c1=96 f v in =1.2v v in =0.9v v in =2.0v v in =1.5v rv5vh202 6.0 5.5 4.5 5.0 4.0 3.5 3.0 output current i out (ma) output voltage v out (v) 0 100 200 300 400 500 topt=25?c l1=27 h c1=96 f v in =0.9v v in =1.5v v in =4.0v v in =2.0v v in =3.0v rv5vh102 6.0 5.5 4.5 5.0 4.0 3.5 3.0 output current i out (ma) output voltage v out1 (v) 0 50 100 150 200 250 300 topt=25?c l1=100 h c1=22 f v in =0.9v v in =1.5v v in =2.0v v in =4.0v v in =3.0v rv5vh102 6.0 5.5 4.5 5.0 4.0 3.5 3.0 output current i out (ma) output voltage v out1 (v) 0 50 100 150 200 250 300 topt=25?c l1=220 h c1=22 f v in =0.9v v in =1.5v v in =2.0v v in =4.0v v in =3.0v 2) output voltage vs. output current (rv5vh2 )
27 rv5vh1 /rv5vh2 3) efficiency vs. output current (rv5vh1 ) rv5vh101 100 75 80 85 90 95 65 70 55 60 50 output current i out (ma) efficiency h (%) 0.01 0.1 1 10 100 topt=25?c l1=100 h c1=22 f v in =0.9v v in =1.2v v in =2.0v v in =1.5v rv5vh101 100 75 80 85 90 95 65 70 55 60 50 output current i out (ma) efficiency h (%) 0.01 0.1 1 10 100 topt=25?c l1=220 h c1=22 f v in =1.2v v in =2.0v v in =1.5v v in =0.9v rv5vh102 100 75 80 85 90 95 65 70 55 60 50 output current i out (ma) efficiency h (%) 0.1 1 10 100 1000 topt=25?c l1=100 h c1=22 f v in =1.5v v in =0.9v v in =2.0v v in =3.0v v in =4.0v rv5vh102 100 75 80 85 90 95 65 70 55 60 50 output current i out (ma) efficiency h (%) 0.1 1 10 100 1000 topt=25?c l1=220 h c1=22 f v in =1.5v v in =0.9v v in =2.0v v in =3.0v v in =4.0v rv5vh201 90 65 70 75 80 85 55 60 45 50 40 output current i out (ma) efficiency h (%) 0.01 0.1 1 10 100 1000 topt=25?c l1=27 h c1=96 f v in =1.5v v in =0.9v v in =1.2v v in =2.0v rv5vh202 90 65 70 75 80 85 55 60 45 50 40 output current i out (ma) efficiency h (%) 0.1 1 10 100 1000 topt=25?c l1=27 h c1=96 f v in =1.5v v in =0.9v v in =2.0v v in =3.0v v in =4.0v 4) efficiency vs. output current (rv5vh2 )
rv5vh1 /rv5vh2 28 5) dc/dc1 output voltage vs. temperature rv5vh1 /2 3.3 3.0 3.2 3.1 2.9 2.8 2.7 temperature topt(?c) output voltage v out (v) ?0 ?0 ?0 0 20 40 60 80 100 v in =1.2v l1=100 h c1=22 f i out =10ma i out =5ma i out =0a rv5vh1 /2 5.3 5.0 5.2 5.1 4.9 4.8 4.7 temperature topt(?c) output voltage v out (v) ?0 ?0 ?0 0 20 40 60 80 100 v in =3v l1=100 h c1=22 f i out =10ma i out =0a i out =1ma rv5vh1 /2 150 125 130 135 140 145 100 105 110 115 120 temperature topt(?c) oscillator frequency fosc(kh z ) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =3v rv5vh1 /2 150 125 130 135 140 145 100 105 110 115 120 temperature topt(?c) oscillator frequency fosc(kh z ) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =5v rv5vh1 /2 80 65 70 75 50 55 60 temperature topt(?c) oscillator duty cycle maxdty(%) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =3v rv5vh1 /2 80 65 70 75 50 55 60 temperature topt(?c) oscillator duty cycle maxdty(%) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =5v 7) oscillator duty cycle vs. temperature 6) oscillator frequency vs. temperature
29 rv5vh1 /rv5vh2 8) on resistance of lx vs. supply voltage rv5vh1 5.0 4.0 4.5 2.5 3.0 2.0 3.5 0.0 1.5 1.0 0.5 supply voltage v out1 (v) on resistance ron ( w ) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 85?c 25?c ?0?c rv5vh201 18 12 10 8 16 14 0 6 4 2 temperature topt(?c) output current i out (ma) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =3v ?? output current ?? output current rv5vh202 18 12 10 8 16 14 0 6 4 2 temperature topt(?c) output current i out (ma) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =5v ?? output current ?? output current rv5vh1 /2 2 1 1.2 1.4 1.6 1.8 0 0.2 0.4 0.6 0.8 output current i out (ma) start-up/hold-on voltage vstart/vhold(v) 0 203040 10 50 topt=25?c v out1 =3v l1=100 h c1=22 f vstart vhold rv5vh101 10 ? 10 ? 10 ? 10 ? 10 ? 10 ? 10 ? input voltage v in (v) input current i in (a) 0.0 1.0 1.5 2.0 2.5 0.5 3.0 topt=25?c csw=gnd l1=100 h c1=22 f i out =30ma i out =5ma i out =1ma i out =0a 10) start-up/hold-on voltage vs. output current 9) ext1 output current vs. temperature 11) input current vs. intput voltage
rv5vh1 /rv5vh2 30 12) output voltage vs. output current rv5vh101 0 ? ? ? ?4 ?0 ?2 ? output current i out (ma) output voltage v out (v) 048 61012 214 topt=25?c v in =1.2v v out1 =3v v set ?v v set ?v v set ?2v v set ?v rv5vh1 /2 0.010 ?.010 ?.004 ?.002 0.000 0.002 0.004 0.006 0.008 ?.006 ?.008 temperature topt(?c) feed back voltage v fb (v) ?0 ?0 ?0 0 20 40 60 80 100 rv5vh1 /2 20 0 6 8 10 12 14 16 18 4 2 temperature topt(?c) output current i out (ma) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =3v ?? output current ?? output current rv5vh1 /2 20 0 6 8 10 12 14 16 18 4 2 temperature topt(?c) output current i out (ma) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =5v ?? output current ?? output current 14) ext2 output current vs. temperature 13) dc/dc2 feed back voltage vs. temperature ? dc/dc converter 2
31 rv5vh1 /rv5vh2 15) ext2 oscillator frequency vs. temperature rv5vh1 /2 150 100 115 120 125 130 135 140 145 110 105 temperature topt(?c) oscillator frequency fosc(kh z ) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =3v rv5vh1 /2 150 100 115 120 125 130 135 140 145 110 105 temperature topt(?c) oscillator frequency fosc(kh z ) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =5v rv5vh1 /2 60 40 46 48 50 52 54 56 58 44 42 temperature topt(?c) oscillator duty cycle maxdty(%) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =3v rv5vh1 /2 60 40 46 48 50 52 54 56 58 44 42 temperature topt(?c) oscillator duty cycle maxdty(%) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =5v rv5vh1 /2 2.0 0.0 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0.4 0.2 temperature topt(?c) csw on/off voltage (v) ?0 ?0 ?0 0 20 40 60 80 100 v out1 =3v 17) csw on/off voltage vs. temperature 16) ext2 oscillator duty cycle vs. temperature
rv5vh1 /rv5vh2 32 18) detector threshold voltage vs. temperature rv5vh1 /2 3.0 2.5 2.7 2.8 2.9 2.6 temperature topt(?c) detector threshold voltage v det (v) ?0 ?0 ?0 0 20 40 60 80 100 +v det ? det rv5vh1 /2 5.0 4.5 0.0 2.0 1.5 3.0 2.5 4.0 3.5 1.0 0.5 v out1 output voltage v out1 (v) output current v out (v) 012345 85?c 25?c ?0?c rv5vh1 /2 20 18 0 8 6 12 10 16 14 4 2 v out1 output voltage v out1 (v) d out output current i dout (ma) 01234567 85?c 25?c ?0?c rv5vh1 /2 0.7 0.6 0.0 0.4 0.3 0.5 0.1 0.2 v sen output voltage v sen (v) v sen output current i vsen ( a) 01234567 85?c 25?c ?0?c rv5vh1 /2 10 0.01 1 0.1 load capacitance c out ( f) output delay time tp(ms) 0.0001 0.1 0.01 0.001 t plh t phl v out1 =3v 22) output delay time vs. load capacitance 20) d out output current vs. v out1 output voltage 19) v out1 output voltage vs. output current 21) v sen output current vs. v sen output voltage ? voltage detector
33 block diagram + + csw fb1 v dd ext1 d out fb2 ext2 gnd vref error amp.1 error amp.2 1 2 3 4 8 7 6 5 vfm2 vfm1 osc p_shift + dc/dc converter controller (boost / inverting output for lcd) rv5vh3 pin configuration 1 2 3 4 8 7 6 5 ? 8 pin ssop (0.65mm pitch)
rv5vh3 34 pin description absolute maximum ratings absolute maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. moreover, such values for any two items must not be reached simultaneously. operation above these absolute maximum ratings may cause degradation or permanent damage to the device. these are stress ratings only and do not necessarily imply functional operation below these limits. pin no. symbol description 1 csw control switch for dc/dc1, 2 2 fb1 input for dc/dc1 error amplifier 3v dd power supply for device itself. sensing pin for reset. 4 ext1 external transistor drive pin for dc/dc1 (cmos output) 5 gnd ground pin 6 ext2 external transistor drive pin for dc/dc2 (cmos output) 7 fb2 input for dc/dc2 error amplifier 8d out output for voltage detector symbol item ratings unit v dd v dd pin voltage 12 v d out d out pin voltage 12 v v csw csw pin voltage C0.3 to v dd +0.3 v v ext1, 2 ext1, 2 pin voltage C0.3 to v dd +0.3 v v fb fb1,2 pin voltage C0.3 to v dd +0.3 v i ext1, 2 ext1, 2 output current 50 ma p d power dissipation 300 m w topt operating temperature C40 to +85 ?c tstg storage temperature C55 to +125 ?c tsolder lead temperature (soldering) 260?c 10sec absolute maximum ratings gnd=0v
35 rv5vh3 symbol item conditions min. typ. max. unit v set1 output voltage setting 1 2.05 * 1 v v fb1 feed back volatage 1 1.950 2.000 2.050 v v in max maximum input voltage 10 v v opt min minimum operating voltage specified as a v dd 1.8 v voltage for device operation i ss11 supply current11* 2 csw=h, fb1=1.9v 15 60 a i ss12 supply current12* 2 csw=h, fb1=2.1v 4 a istandby standby current* 3 csw=l 4 11 a i ext1h ext1 h output current v ext1 =v dd C0.4v 1.5 3 ma i ext1l ext1 l output current v ext1 =0.4v 4 8 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle on (v ext1 =l) 50 65 80 % d v fb1 feed back voltage temp.coefficient C40?c topt 85?c 100 ppm/?c d topt v cswh csw h input voltage 1.6 v dd v v cswl csw l input voltage 0 0.4 v i csw leak csw input leakage current csw=3.0v or csw=0v C0.5 0.5 a * ) v dd =3.0v, i out =10ma : unless otherwise specified. (see typical application) * 1 ) adjustable by external resistors (to 30v). * 2 ) supply current for dc/dc1. supply current for vd or external resistors are excluded. * 3 ) standby current includes supply current for dc/dc1, 2 and vd. v dd =3.0v, topt=25?c electrical characteristics ? rv5vh301 dc/dc converter 1
rv5vh3 36 dc/dc converter 2 symbol item conditions min. typ. max. unit v set2 output voltage setting 1 * 1 0v v fb2 feed back volatage 1 C20 0 20 mv v in max maximum input voltage 10 v v opt min minimum operating voltage specified as the v dd 1.8 v voltage for device operation i ss21 supply current21* 2 csw=h, fb2=0.1v 15 60 a i ss22 supply current22* 2 csw=h, fb2=C0.1v 4 a i ext2h ext2 h output current v ext2 =v dd C0.4v 2 4 ma i ext2l ext2 l output current v ext2 =0.4v 4 8 ma fosc maximum oscillator frequency 110 130 150 khz maxdty oscillator duty cycle on (v ext2 =l) 40 50 60 % d v fb2 feed back voltage temp.coefficient C40?c topt 85?c 30 v/?c d topt * ) v dd =3.0v : unless otherwise specified. (see typical application) * 1 ) adjustable by external resistors (to -30v). * 2 ) this value shows only the supply current of dc/dc2, not include the supply current of external resistors. v dd =3.0v, topt=25?c
37 rv5vh3 voltage detector symbol item conditions min. typ. max. unit v det detector threshold 2.633 2.700 2.767 v v hys detector threshold hysteresis 0.081 0.135 0.189 v i ss3 supply current3* 1 1.2 a v in max maximum input voltage 10 v v opt min minimum operating voltage specified as the v dd 1.8 v voltage for device operation i out output current v ds =0.5v, v dd =1.5v 1.0 2.0 ma v ds =0.5v, v dd =3.0v 4.0 5.0 ma t plh output delay 100 s d v out1 detector threshold temp.coefficient C40?c topt 85?c 100 ppm/?c d topt i doutleak d out leakage current 0.03 0.5 a * ) v dd =3.0v : unless otherwise specified. * 1 ) this value only shows the supply current of voltage detector. v dd =3.0v, topt=25?c
rv5vh3 38 operation ? dc/dc converter 1 the dc/dc1 can operate by an input voltage to the v dd pin. a change in the v out1 will feed back to the internal error amplifier through external voltage setting resistors and internal feed back resistors. when the feed back voltage is lower than the reference voltage, the error amplifier enables oscillation or otherwise, it will stop oscillation. the internal feed back resistor r which is fixed and adjusted by laser trim can make the feed back input voltage to error amp.1 stable. pulses from the osc circuit have a duty cycle of 50% and it becomes 65 to 75%(at high side) through the p_shift circuit. these clock pulses control vfm circuit and make it possible to operate as a boost converter. the output of ext1 is driven by cmos buffer and an external nmos driver is also available instead of an npn transis- tor, in such cases the rb and the cb are not necessary. the dc/dc1 can be shut down by csw pin. when the csw pin is h, v dd level, the dc/dc1 is enabled and when the csw pin is l, gnd level, the dc/dc1 is disabled. the ext1 pin outputs l while the dc/dc1 is disabled. ? set output voltage dc/dc1 v out1 is described as follows : v out1 : r1+r2=vfb1 : r2 dc/dc1 controls vfb1 to be a constant voltage, v out1 =vfb1 (r1+r2) / r2 thus, any output voltage of dc/dc1 can be set by changing r1 or/and r2. certain temperature coefficient of v out1 can be set by using r1, r2 having such temperature characteristics. fb1 ext1 + rv5vh3 error amp.1 vfm1 csw 4 1 2 osc r2 r1 p_shift c l1 sbd v out1 v in npn tr. cb rb 3 vref v dd
39 rv5vh3 ? dc/dc converter 2 the dc/dc2 can operate by an input voltage to the v dd pin. a change in the v out2 will feed back to the internal error amplifier through external voltage setting resistors. the v ref voltage should be provided from externally fixed power sup- ply such as v out1 . when the feed back voltage to the error amp.2 is higher than the ground voltage, the error amplifier enables oscillation otherwise, it will stop oscillation. pulses from the osc circuit have a duty cycle of 50% and it makes vfm operation allowable. there might be certain cases that the duty cycles become smaller temporarily at light load current. the output of ext2 is driven by cmos buffer operated v dd and gnd. a pmos driver will be connected to the ext2 pin and its switching operation generates negative output voltage through energy accumulated in an inductor. the dc/dc1 can be shut down by csw pin. when the csw pin is high, v dd level, the dc/dc1 is enabled and when the csw pin is l, gnd level, the dc/dc1 is disabled. the ext2 pin outputs h while the dc/dc2 is disabled. ? set output voltage dc/dc 2 v out2 is described as follows: v ref : r1=|Cv out2 | : r2 the fb2 voltage is controlled to 0v and v ref is provided externally |Cv out2 |=v ref r2/r1, thus, any output voltage of dc/dc2 can be set by r1 and r2. certain temperature coefficient of v out2 can be set by using r1, r2 having such temperature characteristics. c1 l fb2 v out2 v dd ext2 + rv5vh3 error amp.2 vfm2 csw 6 1 7 sbd + pmos osc c2 r2 r1 v ref
rv5vh3 40 d out rv5vh3 pull-up output tr. + vref r1 r2 r3 tr.1 3 8 v dd the voltage detector can operate by an input voltage to the v dd pin. the detector threshold and the reset voltage are internally adjusted by trimmed resistors and the vd monitors v dd pin voltage. the d out is nch open-drain output and a pull up resistor is necessary. oepration diagram the output is pulled up to v dd voltage ? voltage detector a b reset voltage detector threshold gnd gnd output voltage 1 2 3 4 5 hysteresis range +v det ? det step step 1 step 2 step 3 step 4 step 5 comparator(+) pin input voltage abbba comparator output hll lh tr. 1 off on on on off output tr. off on indefinite on off step 1. output voltage is equal to pull-up voltage step 2. when input voltage(v dd ) reaches to the state of v ref 3 v dd (r2+r3)/(r1+r2+r3) at point a, the output of the comparator is reversed, so that the output voltage becomes to gnd. step 3. output voltage becomes indefinite when power source voltage (v dd ) is smaller than minimum operating voltage. when the output is pulied up, output becomes pull-up voltage and gnd. step 4. output voltage becomes to gnd. step 5. when input voltage(v dd ) reaches to the state of v ref v dd r2/(r1+r2) at point b, the output of the comparator is reversed, so that the output voltage becomes to pull-up voltage. a: r2+r3 v dd r1+r2+r3 b: r2 v dd r1+r2+r3
41 rv5vh3 typical application 1 csw fb1 v dd ext1 d out fb2 ext2 gnd output dc/dc 2 output dc/dc 1 c2 l2 pmos r3 r1 r2 c3 sbd c1 npn tr. sbd r6 r4 c4 r5 c5 l1 coii l1 : 100h, l2 : 100h diode schottky type capacitor c1 : 22f(ta), c2 : 22f(ta) c3 : 0.01f (ceramic) c4 : 0.01f (ceramic) c5 : 0.01f (ceramic) pmos 2sj238 (toshiba) nmos 2sk1470 (sanyo) resistor r1 : 100k w , r2 : 0 to 500k w r3 : 100k w r4 : 300 w r5 : 0 to 500k w, r6 : 50k w
rv5vh3 42 csw fb1 v dd ext1 d out fb2 ext2 gnd c2 l2 pmos r3 r1 v in r2 c3 sbd c1 npn tr. sbd r6 r4 c4 r5 c5 l1 output dc/dc 2 output dc/dc 1 typical application 2 coii l1 : 100h, l2 : 100h diode schottky type capacitor c1 : 22f(ta), c2 : 22f(ta) c3 : 0.01f (ceramic) c4 : 0.01f (ceramic) c5 : 0.01f (ceramic) pmos 2sj238 (toshiba) npn tr. 2sd1628g (sanyo) resistor r1 : 100k w , r2 : 0 to 500k w r3 : 100k w r4 : 300 w r5 : 0 to 500k w, r6 : 50k w description ? step up dc/dc converter : dc/dc1 the oscillator can operate when csw is h. when the csw is l the ext1 outputs gnd. the output voltage can be adjusted by r5 and r6 with fb1 of two volt. ? invering dc/dc converter : dc/dc2 the oscillator can operate when csw is h. when the csw is l the ext2 outputs v dd . the output voltage can be adjusted by r1 and r2 with fb2 of zero volt. ? voitage detector v dd pin can be monitored. this could be always operated with v dd . the d out pin outputs l when low voltage is detected with nch open-drain output.
43 rv5vh3 csw fb1 v dd ext1 d out fb2 ext2 gnd c2 l2 r3 r1 r2 c3 sbd3 c1 pnp tr. sbd1 r6 r5 c5 l1 r4 c4 nmos pmos v in sbd2 output dc/dc 2 output dc/dc 1 r1 : 820k w , r2 : 820k w , r3 : 100k w , r4 : 1k w , r5 : 750k w (adjustabie) r6 : 100k w l1 : 68h, l2 : 27h c1 : 22f, c2 : 22f, c3 : 1000pf, c4 : 2200pf, c5 : 1000pf pmos : 2sj238, nmos : 2sk1470, pnptr. : 2sb1120f operation the v dd voltage can be supplied from another source than battery output and a reference voltage for dc/dc2 is supplied by the output of dc/dc1. the pmos transistor can operate as a switch when the csw is l. ? step up dc/dc converter : dc/dc1 the oscillator can operate when csw is h. when the csw is l the ext1 outputs gnd. the output voltage can be adjusted by r5 and r6 with fb1 of two volt. ? invering dc/dc converter : dc/dc2 the oscillator can operate when csw is h. when the csw is l the ext2 outputs v dd . the output voltage can be adjusted by r1 and r2 with fb2 of zero volt. ? voitage detector v dd pin can be monitored. this could be operated all the time by v dd . the d out pin outputs l when low voltage is detected with nch open-drain output. typical application 3
rv5vh3 44 typical characteristics 1) output voltage vs. output current 25 15 10 5 ? ?5 ?0 ?0 20 0 ?5 output current i out (ma) output voltage v out (v) 01020 v in =3.6v 100 90 80 70 60 50 40 30 20 output current i out (a) efficiency h (%) 0.0001 0.001 0.01 0.1 v in =3.6v 20v 15v 10v v out 5.0v 2) efficiency vs. output current 3) csw load transient responce 1 20 15 0 10 5 ? ?5 ?0 ?0 time t(ms) output voltage v out (v) ?0 0 50 100 150 200 v in =3.6v, i out =1ma v out1 v out2 csw 20 15 0 5 10 ? ?0 ?5 ?0 time t(ms) output voltage v out (v) 0 500 1000 1500 v in =3.6v, i out =1ma v out1 csw v out2 4) csw load transient responce 2 * ) please refer to typical application.
45 rv5vh3 selection guide the output voltage, the type of dc/dc1 and the taping type for the ics can be selected at the user's request. the selection can be made by designating the part number as shown below: rv5vh C ? part number -- - ab c } } code contents dc/dc1 type a 1 : internal l x driver transister type 2 : external ext driver transister type 3 : variable output voltage type b serial (01, 02, 03) number of setting dc/dc1 output voltage and setting vd detect voltage. c designation of taping type ex. e1, e2 (refer to taping specifications, e2 type is prescribed as a standard.)
rv5vh3 46 application hints when using these ics, be sure to take care of the following points. ? set external components as close as possible to the ic and minimize the connection between the components and the ic. in particular, when an external component is connected to vout pin, make minimum connection with the capacitor. ? make sufficient grounding. a large current flows through gnd pin byswitching. when the impedance of the gnd connection is high, the potential within the ic is varied by switching current. this may result in unstableoperation of the ic. ? use capacitor with good high frequency characteristics such as tantalum capacitor, aluminium electrolytic capacitor and ceramic capacitor. we recommend the use of a capacitor with an allowable voltage which is at least three times the output set voltage. this is because there may be the case where a spike-shaped high voltage is generated by the inductor when lx transistor is turned off. ? take the utmost care when choosing an inductor. namely, choose such an inductor that has sufficiently small d.c. resistance and large allowable current, and hardly reaches magnetic saturation. when the inductance value of the inductor is small, there may be the case where ilx exceeds the absolute maximum ratings at the maximum load. use an inductor with an appropriate inductance. (see output current and selection of peripheral components sections.) ? use a diode of a schottky type with high switching speed, and also take care of the rated current. (see output current and selection of peripheral components sections.) the performance of power source circuits using these ics largely depends upon the peripheral components. take the utmost care in the selection of the peripheral components. in particular, design the peripheral circuits in such a manner that the values such as voltage, current and power of each component, pcb patterns and the ic do not exceed their respective rated values.

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